1. crustaceans: hard shelled animals, for example crabs or lobsters.
  2. oysters/mussels: edible bivalve molluscs.
  3. fish: vertebrate cold blooded animal with gills, living in water.
  4. seaweed: the general name for marine plants of the Algae class which grow in long narrow ribbons. (International Maritime Dictionary, 2nd Ed.)
  5. pearl culture farm: an area where pearls are artificially cultivated.